Question

the quantized energy of an electron in hydrogen atom for the nth energy level is given by En= -1.312/n²*10⁶ J per mol . calculate the energy required to remove the electron completely from an excited hydrogen atom when its quantized level = 3

Answer 1

E_n = $-\frac{1.312\times {10}^6}{{\mathrm{n}}^2}\mathrm{J}{\mathrm{mol}}^{-1}$
Ionisation energy = E_∞-E_n
​ = 0 - ${\mathrm{E}}_{\mathrm{n}}=\frac{1.312\times {10}^{6^{}}\mathrm{J}/\mathrm{mol}}{(3{)}^2}=1.45\times {10}^5\mathrm{J}/\mathrm{mol}$